Vaillant geoTHERM VWS Installation guide

Brand: Vaillant

Model: geoTHERM VWS

Category: Heat pumps

Type: Installation guide

This manual is also suitable for

geoTHERM 6-10kw

For the heating engineer

Installation instructions

geoTHERM

Heat pump

VWS

Installation instructions geoTHERM VWS 0020046310_012

Contents

1 Notes on the documentation ........................... 3

1.1 Storage of the documents ...................................... 3

1.2 Symbols used ............................................................. 3

1.3 Applicability of the manual ..................................... 4

1.4 CE label ........................................................................ 4

1.5 Intended use ............................................................... 4

2 Description of the appliance ........................... 5

2.1 Data badge .................................................................. 5

2.2 Functional principle .................................................. 6

2.3 Design of the heat pump ......................................... 7

2.4 General notes on operating modes and

functions ...................................................................... 9

3 Safety instructions and regulations .............. 10

3.1 Safety instructions ................................................... 10

3.2 Regulations, rules, guidelines ............................... 10

3.3 Coolants ....................................................................... 11

4 Assembly and installation ............................... 12

4.1 Accessories ................................................................. 12

4.2 Requirements of the installation site .................. 12

4.3 Dimensions and clearances .................................... 13

4.4 Assembly/Installation at a glance ........................ 14

4.5 Preparatory work in the installation area .......... 14

4.6 Requirements of the heating circuit .................... 15

4.7 Scope of delivery ...................................................... 15

4.8 Unpacking the unit and checking the delivery .. 16

4.9 Transporting the heat pump .................................. 16

4.10 Installing the heat pump ......................................... 17

4.11 Removing the cladding ............................................ 18

4.12 On-site installation .................................................... 19

4.12.1 Assembly of the heating system ........................... 20

4.12.2 Assembly, brine circuit ............................................ 20

4.13 Fitting the VRC DCF outside temperature

sensor ........................................................................... 21

4.14 Fitting the VR 90 remote control unit................. 21

4.15 Installing the VR 60 mixer module ....................... 21

5 Filling the heating and heat source systems 21

5.1 Filling the heating circuit ........................................ 21

5.2 Filling the brine circuit ............................................. 21

6 Electrical installation ....................................... 24

6.1 Safety and installation information...................... 24

6.2 Regulations pertaining to electrical

installations ................................................................ 24

6.3 Electronic box ............................................................ 25

6.4 Connecting the power supply ................................ 25

6.4.1 Unblocked mains supply (Electroplan 1) .............. 26

6.4.2 Dual circuit feed, heat pump tariff

(Electroplan 2) ........................................................... 27

6.4.3 Dual circuit feed, special tariff

(Electroplan 3) ........................................................... 28

6.4.4 Connecting external components ......................... 29

6.4.5 Simultaneous operation of the compressor

and auxiliary heating ................................................ 30

6.5 Controller PCB at a glance ..................................... 31

6.6 Wiring the controller PCB ....................................... 32

6.6.1 Connecting the VR 10 standard sensor ............... 32

6.6.2 Direct heating operation (Hydraulic plan 1) ....... 33

6.6.3 Mixer circuit with buffer cylinder

(Hydraulic plan 2) ...................................................... 34

6.6.4 Direct heating operation and domestic

hot water cylinder (Hydraulic plan 3) .................. 35

6.6.5 Mixer circuit with buffer cylinder and domestic

hot water cylinder (Hydraulic plan 4) .................. 36

6.7 Connecting the DCF receiver ................................. 37

6.8 Connecting accessories ........................................... 37

6.8.1 Installing the VR 90 remote control unit ............ 37

6.8.2 Connecting further mixer circuits ........................ 38

6.8.3 Connecting vrnetDIALOG ........................................ 38

6.9 Connecting an external boiler ............................... 39

6.10 Fitting the cladding and the control panel ......... 39

7 Start-up .............................................................. 41

7.1 General points regarding start-up ........................ 41

7.2 Operating the controller ......................................... 42

7.2.1 Finding your way around the controller ............. 42

7.2.2 Calling up the screens ............................................. 42

7.3 Carrying out the initial commissioning ............... 43

7.4 Bleeding the brine circuit. ....................................... 44

7.5 Bleeding the heating circuit ................................... 44

7.6 Handing the system over to the operator .......... 44

8 Controller ........................................................... 45

8.1 Operating modes and functions ............................ 45

8.2 Automatic auxiliary functions ................................ 45

8.3 Settable auxiliary functions.................................... 46

8.3.1 Auxiliary functions in the Operator Level: ......... 46

8.3.2 Auxiliary functions in the Code Level: ................. 46

8.3.3 Auxiliary functions via vrDIALOG: ........................ 47

8.4 Description of the controller .................................. 47

8.4.1 Possible system circuits .......................................... 47

8.4.2 Energy balance controller ...................................... 47

8.4.3 Charging principle buffer cylinder ........................ 48

8.4.4 Resetting to factory settings ................................. 48

8.4.5 Controller structure ................................................. 48

8.5 Operator level sequence diagram ........................ 49

8.6 Code level sequence diagram ................................ 50

8.7 Displays in the operator level ................................ 52

8.8 Displays in the code layer ....................................... 57

8.9 Installer Menu ............................................................ 65

8.10 Parameters that can be set with

vrDIALOG 810/2 67

9 Inspection and maintenance ........................... 69

9.1 Notes for maintenance ............................................ 69

9.2 Carrying out maintenance work ............................ 69

9.4 Test operation and restarting................................ 69

10 Troubleshooting and diagnosis ....................... 70

10.1 Error messages on the controller ......................... 70

10.2 Malfunctions of eBUS components ...................... 71

Contents

3Installation instructions geoTHERM VWS 0020046310_01

1 Notes on the documentation

The following notes are intended as guidance throug-

hout the entire documentation.

Further documents apply in combination with this instal-

lation manual.

We accept no liability for any damage caused by fai-

lure to observe these instructions.

Other applicable documents

For the owner of the system:

Operating manual No. 0020045200

For the heating engineer:

Installation instructions,

VPS buffer cylinder No. 0020070601

Installation Manual for vrnetDIALOG No. 839189

Installation manual for vrDIALOG No. 0020023003

The manuals for any accessories and controllers used

also apply.

1.1 Storage of the documents

Please pass this installation manual and all other valid

documents on to the owner of the installation in order

for him or her to store it so that it is available whenever

it is required.

1.2 Symbols used

Please observe the safety instructions in this installation

manual for the installation of the appliance.

Danger!

Immediate risk of serious injury or

death!

Danger!

Danger of death by electric shock!

Danger!

Danger of burning and scalding!

Caution!

Potentially dangerous situation for the

product and environment.

Note!

Useful information and instructions

• Symbol for a necessary task

Contents

Notes on the documentation 1

10.3 Displays in the error memory and under

"Warning message" .................................................. 71

10.4 Temporary shut-down ............................................. 72

10.5 Blocking error ............................................................ 74

10.6 Other errors/malfunctions ..................................... 76

11.2 Packaging .................................................................... 77

11.3 Coolants ....................................................................... 77

12 Warranty and customer service ..................... 77

12.1 Vaillant warranty....................................................... 77

12.2 Vaillant Service .......................................................... 77

13 Technical data .................................................. 78

14 Start-up checklist ............................................. 80

15 Reference ........................................................... 82

Appendix ....................................................................... 85

Sensor characteristics.......................................................... 85

VRC-DCF outside temperature sensor ............................. 86

Heat pump schematic ........................................................... 87

Electrical circuit diagram .................................................... 88

Installation instructions geoTHERM VWS 0020046310_014

1.3 Applicability of the manual

These installation instructions apply exclusively to appli-

ances with the following part numbers:

Type name Article number

VWS 61/2 230 V 0010005501

VWS 81/2 230 V 0010005502

VWS 101/2 230 V 0010005503

Table 1.1 Type designations and article numbers

The part number of the equipment can be taken from

the identification plate.

1.4 CE label

With the CE mark, we confirm as equipment manufactu-

rers that the appliances in the geoTHERM range satisfy

the basic requirements of the following Directives:

– Electromagnetic Compatibility Directive (Council Di-

rective 89/336/EEC)

– Low voltage directive (73/23/EEC)

– EN 14511 (heat pumps with electrically-driven compres-

sors for heating, specifications for appliances for

space heating and for warming drinking water)

– EN 378 (safety and environmentally related specifica-

tions for refrigerating systems and heat pumps)

1.5 Intended use

The Vaillant geoTHERM heat pumps are state-of-the-art

appliances which have been constructed in accordance

with recognised safety regulations. Nevertheless, there

is still a risk of death or serious injury to the user or

others or of damage to the device and other property in

the event of improper use or use for which it is not in-

tended.

This unit is not intended for use by persons (including

children) having limited physical, sensory or mental ca-

pacities or who have inadequate experience and/or

knowledge, unless they are supervised by a person re-

sponsible for their safety or have been given instruc-

tions by him regarding the operation of the unit.

Children must be supervised to ensure that they do not

play with the unit.

The units are intended as heaters for closed hot-water

central heating installations and for hot water generati-

on. Any other use or extended use is considered to be

improper. The manufacturer or supplier is not liable for

any resulting damage. The user alone bears the risk.

The appliances are intended for operation on a power

supply network with a system impedance Z

max

at the

transfer point (house connection) of 0.16 ohms maxi-

mum.

Intended use includes the observance of the installation

manual.

Caution!

Any improper use is forbidden.

The appliances must be installed by a heating engineer,

who is responsible for adhering to the existing regulati-

ons, rules and guidelines.

1 Notes on the documentation

5Installation instructions geoTHERM VWS 0020046310_01

2 Description of the appliance

2.1 Data badge

An identification plate is attached to the baseplate on

the inside of the geoTHERM heat pump. The type desi-

gnation is located at the top on the grey frame of the

pillar (also see Fig. 2.4, Item 1).

R407 C

COP B0/W35

4,2

COP B5/W55

3,0

B0/W35

B5/W55

1/N/PE 230V 50Hz

IP 20

Vaillant GmbH Remscheid / Germany

1/N/PE 230V 50Hz

6,8 kW

2,8 kW

2 / 4 kW

58 A

<16 A

1,9 kg

2,9 (29) MPa (bar)

6,0 kW

6,3 kW

VWS 61/2 230 V

IT FR NO LV LT EE ES UK

Serial-No. 21054500100028300006000001N1

21054500100028300006000001N4

16 A

-- I

-- MPa (bar)

Fig. 2.1 Example of an identification plate

Explanation of the symbols on the identification plate

Rated voltage - compressor

Rated voltage - pumps + controller

Rated voltage - auxiliary heating

Rated maximum power

Rated power - compressor, pumps

and controller

Rated power - auxiliary heating

Start-up current without start-up

current limiter

16 A

Start-up current with start-up

current limiter

Service water tank capacity

Permissible rated overpressure

Coolant type

Filling quantity

Permissible rated overpressure

COP B0/W35

Performance figure at a brine

temperature of 0 °C and a heating

flow temperature of 35 °C

COP B5/W55

Performance figure at a brine

temperature of 5 °C and a heating

flow temperature of 55 °C

B0/W35

Heating output at a brine

temperature of 0 °C and a heating

flow temperature of 35 °C

B5/W55

Heating output at a brine

temperature of 5 °C and a heating

flow temperature of 55 °C

CE mark

VDE/GS mark

Read the Operating and Installation

Manual!

Humidity protection class

Ensure proper disposal at the end

of its useful life (not household

waste)

21054500100028300006000001N4

Serial Number

Table 2.1 Explanation of symbols

Description of the appliance 2

Installation instructions geoTHERM VWS 0020046310_016

2.2 Functional principle

Heat pump systems consist of separate circuits in which

liquids or gases transport the heat from the heat source

to the heating system. As these circuits operate with

differing media (brine/water, coolant and heating

water), they are coupled to one another by means of

heat exchangers. In these heat exchangers the heat

passes from a medium at a high temperature to a medi-

um at a lower temperature.

The Vaillant geoTHERM heat pump uses geothermal en-

ergy as its heat source.

3/4 Environmental energy 4/4 Heating energy

1/4 Electrical energy

Fig. 2.2 Utilisation of heat sources such as geothermal energy

or ground water

Additional

heating

Domestic

hot water cylinder

Heating water circuit

Heat source circuit

Coolant circuit

Hot water

Cold water

Switching valve

Heating water pump

Condenser

Heat source

Brine pump

Evaporator

Compressor

Expansion valve

Heating system

Fig. 2.3 Mode of operation of the heat pump

The system consists of separate circuits which are coup-

led to one another by means of heat exchangers. These

circuits are:

- The heat source circuit, by means of which the energy

from the heat source is transported to the coolant cir-

cuit.

- The coolant circuit, which releases its heat to the hea-

ting water circuit by means of evaporation, compressi-

on, liquefaction and expansion.

- The heating water circuit, which supplies the heating

and the hot water generation for the domestic hot

water cylinder.

The coolant circuit is connected by means of the evapo-

rator (1) to the environmental heat source, from which it

extracts thermal energy. At the same time, the physical

state of the coolant changes; it evaporates. The coolant

circuit is connected by means of the condenser (3) to

the heating system, to which it releases the heat again.

In so doing, the coolant becomes liquid again; it con-

denses.

As thermal energy can only pass from a body at a high-

er temperature to a body at a lower temperature, the

coolant in the evaporator must have a lower tempera-

ture than the environmental heat source. On the other

hand, the temperature of the coolant in the condenser

must be higher than that of the heating water in order

to be able to release the heat to it.

2 Description of the appliance

7Installation instructions geoTHERM VWS 0020046310_01

These different temperatures are produced in the coo-

lant circuit by means of a compressor (2) and an expan-

sion valve (4), which are situated between the evapora-

tor and the condenser. The coolant flows in vapour form

from the evaporator into the compressor, where it is

compressed. This causes the pressure and temperature

of the coolant vapour to rise sharply. The coolant then

flows through the condenser, where it releases its heat

to the heating water by means of condensation. It flows

as a liquid to the expansion valve, where it expands sig-

nificantly and in so doing loses much of its pressure and

temperature. This temperature is now lower than the

brine/water flowing through the evaporator. The coo-

lant can thus take up more heat in the evaporator, tur-

ning into vapour in the process and flowing to the com-

pressor. The cycle starts again.

If required, the electric auxiliary heating can be swit-

ched in by means of the integrated controller.

To prevent the formation of condensate in the interior

of the unit, the pipes of the heat source circuit and the

coolant circuit are insulated. If condensate forms, this

collects in a pan (see Fig. 2.6, Item 11) and is led away

under the unit. Drop formation under the unit is thus

possible.

2.3 Design of the heat pump

The Vaillant geoTHERM heat pump is available in the

following models. The heat pump are, above all, diffe-

rent from each other in their output.

Type name Heating output (kW)

Brine water heat pumps (S0/W35)

VWS 61/2 230 V 6.0

VWS 81/2 230 V 8,1

VWS 101/2 230 V 10.5

Table 2.2 Type summary

You can read the type designation of the heat pump

from the sticker (see Fig. 2.4, Item 1) on the pillar frame.

The heat pump is designed to implement all current

electrical supply tariffs.

Fig. 2.4 Front view

Key to Fig. 2.4

1 Label with heat pump type designation

2 Operating panel

3 vrnetDIALOG mounting plate (behind the pillar cladding)

Description of the appliance 2

Installation instructions geoTHERM VWS 0020046310_018

Fig. 2.5 Rear view

Key to Fig. 2.5

1 Return to domestic hot water cylinder

2 Heat source to the heat pump

3 Heat source from the heat pump

4 Transportation handles

5 Cable feedthrough for electrical connections

6 Heating return

7 Heating feed

Assemblies

Fig. 2.6 Front view, covers removed

Key to Fig. 2.6

1 Electrical connections

2 Controller PCB (under cover plate)

3 Contactor for electric auxiliary heating

4 Safety thermostat STL for the auxiliary heating

5 Electric auxiliary heating

6 Condenser

7 CH pump

8 Fill/drain valve for heating circuit

9 Data badge

10 Compressor

11 Condensate pan

12 Expansion Valve

13 Fill/drain valve for brine circuit

14 Brine pump

15 Evaporator

16 3-way valve

2 Description of the appliance

9Installation instructions geoTHERM VWS 0020046310_01

2.4 General notes on operating modes and func-

tions

There are five operating modes available for the heating

circuit and these can be used for time and temperature

control of the heat pump (see Chap. 8 "Control sys-

tem").

Three additional operating modes are available for the

connected domestic hot water cylinder and circulation

circuit.

During start-up, you will tell the heat pump which of the

connection configurations listed in the appendix cor-

responds to your installation by entering the number of

the corresponding hydraulic plan into the controller.

Thus all the operating parameters will be set to prede-

termined values, so that the heat pump can work opti-

mally. However, you can individually set and adapt the

operating modes and functions afterwards.

You will find all the information on operating modes, au-

xiliary and special functions in Chapter 8, "Control sys-

tem".

The heat pump is equipped with numerous automatic

auxiliary functions to ensure trouble-free operation

(see also Chap. 8.2 "Automatic auxiliary functions"):

– Frost protection

Prevents the heating system from freezing

– Tank frost protection

Prevents the connected tanks from freezing

– Checking the external sensors

Checking the connected sensors during initial commis-

sioning using the basic hydraulic circuit that was

entered previously

– Protection against loss of heating water

Shuts down when there is a loss of heating water and

switches on again when there is sufficient water pres-

sure

- Protection against loss of brine

Shuts down if the brine pressure is too low and swit-

ches on again when the pressure is sufficient

– Floor protection circuit

Overheating protection for the floor (important for

wooden floors)

– Pump blocking protection

Prevents seizing of pumps in the system

- Freeze protection function

Shuts down the compressor if the temperature of the

heat source falls below a predetermined value

Additionally, there are further settable auxiliary func-

tions available (see also Chap. 8.3 "Settable auxiliary

functions"):

– Timer programmes

To set the heating times for each heating circuit

– Holiday programming

Programming of two holiday periods with date entry

and set-back temperature

– Party function

Carries the heating and hot water times forward to

the next shut-off point

– Energy saving function

Lowers the flow setpoint temperature for a presettab-

le period

– Screed floor drying

For drying out screed floors

– Fixed value controlling

Sets a fixed flow temperature

– Anti-legionella function

Kills germs in the tank and in the pipes

– Quick test

Test function for maintenance

– Remote maintenance

Diagnostics and setting via vrDIALOG or

vrnetDIALOG

Description of the appliance 2

Installation instructions geoTHERM VWS 0020046310_0110

3 Safety instructions and regulations

3.1 Safety instructions

The heat pump must be installed by an approved techni-

cian, who will be responsible for adhering to the existing

standards and regulations. We accept no liability for any

damage caused by failure to observe these instructions.

When full, the heat pump weighs roughly 140 -195 kg.

Take this into consideration when transporting and set-

ting up the unit. Pay particular attention to Chap. 4.2,

"Requirements of the installation site", before assembly.

Danger!

The coolant circuit is pressurised. Fur-

thermore, high temperatures can arise.

The appliance may only be opened and

serviced by Vaillant factory customer

service or by a qualified specialist tech-

nician. Work on the coolant circuit may

only be carried out by a qualified refrige-

ration engineer.

Danger!

Risk of electric shock!

Always switch off all power supplies be-

fore carrying out electrical installation

work. Make sure that they are secured

against inadvertent switching on again.

Caution!

Risk of damage!

Do not add any antifreeze or corrosion

protection agents to the heating water,

as seals and other components can be

damaged as a result and this can lead to

water leaks.

If the heating water hardness is more than 3.0 mmol/l

(21.05 °e) it should be softened. You can use the Vail-

lant ion exchanger (Art. No. 990 349) for this purpose.

Observe the enclosed instructions for use.

3.2 Regulations, rules, guidelines

Pay particular attention to the local specifications, pro-

visions, regulations and guidelines on/by the following

when setting up, installing and operating the heat pump:

– electrical connection

– supply system operator

– water distribution company

– geothermal energy utilisation

– integration of heat sources and heating installations

– energy conservation

– hygiene

3 Safety instructions and regulations

11Installation instructions geoTHERM VWS 0020046310_01

3.3 Coolants

The heat pump is delivered with an operational filling of

R 407 C coolant. This is a chlorine-free coolant which

does not affect the Earth's ozone layer. R 407 C is neit-

her a fire hazard nor an explosion risk.

However, maintenance work and interventions into the

coolant circuit may only be undertaken by an expert

technician with appropriate protective equipment.

Danger!

R 407 C coolant!

Do not inhale gases or vapours emana-

ting from leaks in the coolant circuit.

Risk to health! Avoid contact with the

skin and eyes. Escaping coolant can

cause frostbite if the exit point is

touched! R 407 C coolant presents no

danger in normal use and under normal

conditions. With improper use, however,

it can cause injury and damage.

Caution!

This appliance contains R 407 C coolant.

The coolant must not be allowed to es-

cape into the atmosphere. R 407 C is a

fluorinated greenhouse gas covered by

the Kyoto Protocol, with a GWP of 1653

(GWP = Global Warming Potential).

Before the appliance is disposed of, the

coolant it contains must be completely

drained into a suitable vessel so that it

can then be recycled or disposed of in

accordance with the regulations.

The relevant work in connection with the

coolant may only be carried out by offi-

cially certified specialists.

Coolant (see identification plate for

quantity) may only be drained off and

fresh coolant may only be added via the

service valves. All warranties become

void if any approved replacement coolant

other than the R 407 C recommended by

Vaillant is used.

Safety instructions and regulations 3

Installation instructions geoTHERM VWS 0020046310_0112

4 Assembly and installation

4.1 Accessories

You can fit the following accessories to expand the heat

pump system. You can find more detailed information

on the installation of accessories in Chap. 5.8.

Mixer module VR 60

With the mixer module, you can expand the control sys-

tem of the heating installation by two mixer circuits.

You can connect a maximum of six mixer modules.

VR 90 remote control unit

You can connect a separate remote control unit for the

first six heating circuits (HC 1 - HC 6).

VR 10 standard sensor

Additional sensors may be required, e.g. as flow, return,

collector or cylinder sensors, depending on the configu-

ration of the system.

vrDIALOG 810/2

vrDialog is a communications unit with software and

connecting cable which enables you to carry out diagno-

sis, monitoring and parametrisation of the heat pump

from a computer.

vrnetDIALOG 840/2, 860/2

The vrnetDIALOG communications unit enables you to

carry out remote diagnosis, monitoring and parameter

setting on the heat pump from a computer over a tele-

phone connection or via an integrated GSM modem.

VPS heating water buffer cylinder

The VPS buffer cylinder provides an intermediate sto-

rage facility for heating water and can be installed

between the heat pump and heating circuit. It provides

the necessary energy to bridge over the power compa-

ny blocking periods.

Other accessories

- Heat transfer fluid

- Filling pump

- Safety assembly and tundish

- Expansion vessel for the heating circuit

4.2 Requirements of the installation site

– Choose a dry room that is generally frost-proof.

– The floor must be level and sufficiently stable to be

able to bear the weight of the heat pump, together

with a DHW and possibly a buffer tank.

– It must be possible to install suitable pipe conduits

(for heat source, DHW and heating).

– When choosing the installation site, bear in mind that

when operating, the heat pump can transmit vibra-

tions to the floor or nearby walls.

- In accordance with DIN EN 378 T1, the minimum instal-

lation space for heat pumps, (V

min

), is calculated as

follows:

min

= G/c

G = coolant fill quantity in kg

c = practical limit in kg/m

(c = 0.31 kg/m

applies for R 407C).

This yields the following minimum installation space:

Heat pump type Coolant fill quantity

[kg]

Minimum

installation space

VWS 61/2 230 V 1.9 6.1

VWS 81/2 230 V 2.2 7.1

VWS 101/2 230 V 2.05 6.6

Table 4.1 Minimum installation space

4 Assembly and installation

13Installation instructions geoTHERM VWS 0020046310_01

4.3 Dimensions and clearances

600

100

140140

75 75

1200

0-10

600

835

650

Fig. 4.1 Dimensions and clearances

Adjustable feet adjustable in height by 10 mm

Assembly and installation 4

Installation instructions geoTHERM VWS 0020046310_0114

300 mm

10 mm

600 mm

300 mm

Fig. 4.2 Minimum clearances for installing the heat pump

4.4 Assembly/Installation at a glance

– Remove packing material.

– Remove transportation safety devices.

– Transport the heat pump to the installation area.

– Position and align the heat pump in the intended as-

sembly location.

– Remove the upper cladding.

– Remove the front cladding.

– Connect the on-site piping.

– Carry out the electrical installation.

– Fill the heating circuit.

– Fill the heat source circuit.

– Fit the cladding.

– Fit the operating console.

– Carry out the initial commissioning.

– Fill out the start-up checklist.

– Hand over system to the user and familiarise him with

it.

4.5 Preparatory work in the installation area

Fig. 4.3 Preparatory work in the installation area

• Make sure that the substrate is sufficiently stable (see

Chap. 4.2 "Requirements for the installation site“).

• Drill at least two bore holes, bearing in mind the di-

mensions of the unit and its connections (1).

• A separate bore hole is required for each heat source

pipe.

• Special pipe lead-throughs must be used if there is a

risk of ground water penetration (follow the

manufacturer's details).

• Take account of the distances to the core barrels for

the rest of the installation.

• Pass the heat source pipes (2) from the outside into

the installation area.

• Lay the heat source pipes (2) centrally in the bore

holes (1) to facilitate all-round thermal insulation.

• Seal the annular gap (1) as shown with foam insulation

(e.g. PE foam) (3).

• Install diffusion-tight insulation pipes from heat sour-

ces in cellar areas, as condensation will otherwise

form (pipe temperature may be as low as -15 °C).

4 Assembly and installation

15Installation instructions geoTHERM VWS 0020046310_01

4.6 Requirements of the heating circuit

The heat pump is only suitable for connection to a

closed central heating installation. To ensure trouble-

free operation, the central heating installation must

have been installed by authorised technical personnel in

compliance with the applicable regulations.

A heat pump is suited to low temperature heating sys-

tems. The system must therefore be designed for low

flow temperatures (ideally around 30 to 35 °C). Further-

more, it must be ensured that power company outages

are bridged over.

EN 12828 requires the following the heating system in-

stallation:

– a filling valve, in order to fill the heating system with

water or be able to drain the water,

– a diaphragm expansion vessel in the return line of the

heating circuit,

– an overpressure safety valve (opening pressure 3 bar)

with pressure gauge (safety group) in the flow line of

the heating circuit, immediately after the appliance,

– an air/dirt separator in the return line of the heating

circuit.

To avoid energy losses and protect against freezing,

thermal insulation must be installed on all supply lines.

The lines must be dirt free - so flush these through tho-

roughly before filling, if necessary.

Caution!

Risk of damage!

Do not add any antifreeze or corrosion

protection agents to the heating water,

as seals and other components can be

damaged as a result and this can lead to

water leaks.

In hydraulic installations that are predominantly equip-

ped with thermostatically or electrically controlled val-

ves, it is necessary to ensure a constant, adequate flow

through the heat pump. Regardless of the choice of hea-

ting system, the nominal flow rate of heating water

must be ensured. This is guaranteed by using a professi-

onally installed buffer cylinder.

4.7 Scope of delivery

Fig. 4.4 Checking the supplied material

For key, see Table 4.2.

The heat pump is delivered on a pallet in two packing

units.

• Check the heat pump and the separately packaged

operating console for any transport damage.

Assembly and installation 4

Installation instructions geoTHERM VWS 0020046310_0116

Pos. Description

1 1 Heat pump

2 1 Operating console, pillar cover

Gaskets (yellow/green) for heating circuit elbow

unions

M6 flat-headed screws for fitting the operating

console to the frame (plus one spare screw)

Self-tapping screws for the operating console

frame (incl. one spare screw)

Self-tapping screws for fastening the

vrnetDIALOG unit

4 1 6 Litre brine expansion tank incl. brass adapter,

max. 3 bar

5 1 VRC-DCF outside temperature sensor

6 4 VR 10 sensors

7 1 Control cable for vrnetDIALOG

8 5 45° connection elbow with cap nuts

9 1 Expansion relief valve for brine circuit, 1/2", 3 bar

10 1 Bag of small parts for fastening the brine

expansion tank

11 1 Clamp for fastening the brine expansion tank

12 1 Insulation matting for heat source connection on

the rear wall

13 5 Installation instructions, operating manual

14 2 Seals with metal support rings for heat source

circuit connection elbows

Table 4.2 Scope of delivery

The frame for the operating console is already fastened

to the heat pump casing on delivery.

4.8 Unpacking the unit and checking the delivery

2 x

Fig. 4.5 Removing the transport securing device

• Carefully remove the packaging and padding, taking

care not to damage any parts of the unit.

• Unfasten the transport securing devices (brackets)

with which the heat pump is fixed to the pallet.

The brackets are no longer required.

4.9 Transporting the heat pump

We recommend that the heat pump be transported with

the aid of a suitable barrow. The handles on the rear

side of the unit are provided as transportation aids (see

Fig. 2.5, Item. 4).

Danger!

Risk of injury!

Depending on type, the heat pump

weighs 140 - 195 kg in the unfilled state.

To avoid injury, use several people to lift

it.

Caution!

Risk of damage!

Regardless of the mode of transport, the

heat pump must never be tilted by more

than 45°. Otherwise it can cause mal-

functions in the coolant circuit during

later operation, which in the worst case

can lead to a failure of the whole sy-

stem.

max. 45°

Fig. 4.6 Transporting the heat pump (carrying)

4 Assembly and installation

17Installation instructions geoTHERM VWS 0020046310_01

We recommend that the heat pump be transported with

the aid of a suitable barrow.

max. 45°

Fig. 4.7 Transporting the heat pump (pushcart)

Caution!

Risk of damage!

Find out the weight of your heat pump

from the Technical Data and make sure

that the transport equipment you select

is appropriately designed.

When using a barrow, take note:

• Only use the barrow on the rear side of the heat

pump, as the weight distribution is then the most fa-

vourable.

• Fasten the heat pump with a restraining strap.

• Use a ramp when pushing the barrow from the pallet,

e.g. a batten and a sturdy board.

4.10 Installing the heat pump

0-10 mm

Fig. 4.8 Adjusting the feet

• Pay attention to the minimum wall clearances when

installing the heat pump (see Fig. 4.2).

• Align the heat pump horizontally by adjusting the feet.

Assembly and installation 4

Installation instructions geoTHERM VWS 0020046310_0118

4.11 Removing the cladding

The cladding panels are screwed on and additionally

provided with retaining clips.

Fig. 4.9 Removing the upper cover

• Remove the pipe access cover, which is fastened with

retaining clips, by pulling it gently upwards.

• Unfasten the screws for the upper cover which are

concealed beneath it.

• Remove the upper cover in an upwards direction.

Fig. 4.10 Removing the front lower cladding

• Unfasten the two screws on the console frame and

pull it, together with the front lower cladding, away

from the casing.

Fig. 4.11 Removing the front upper cladding

• Unfasten the two screws on the front of the front

upper cladding and remove the cladding.

4 Assembly and installation

19Installation instructions geoTHERM VWS 0020046310_01

4.12 On-site installation

Caution!

Flush the heating system thoroughly be-

fore connecting the appliance!

By doing that, residue such as welds,

cinder, hemp, putty, rust, rough dust and

similar substances are removed from the

pipes. Otherwise such substances can be

deposited in the appliance and cause da-

mage.

Caution!

To prevent leaks, take care that no me-

chanical stresses are created on the

connection lines!

- The pipework installation must be carried out in ac-

cordance with the dimensional and connection dra-

wings in Fig. 4.1.

- The installation must be performed by a specialist fit-

ter.

- The applicable regulations must be observed during

the installation.

Note!

Air in the heating system leads to im-

paired operation and reduces the heating

output. Fit bleed valves as required.

Fig. 4.12 Fitting the connection elbows

Key to Fig. 4.12

1 Heating feed

2 Heating return

3 Return to domestic hot water cylinder

4 Heat source to the heat pump

5 Heat source from the heat pump

6 Insulating pad

7 Blanking plugs

Caution!

To avoid leaks, take care that the cor-

rect seals are used on the connecting el-

bows!

Leaks can result if the seals with the

metal support ring are not used in the

heat source circuit!

• Remove the blanking plugs from the appliance con-

nections (7). They are no longer needed and can be

disposed of.

• Fit the three connecting elbows (1 to 3) with the yel-

low/green gaskets supplied with the accessories.

• Fit the two connecting elbows (4 and 5) with the seals

with the metal support ring supplied with the accesso-

ries.

• The accessory kit contains an insulating pad for insu-

lating the connection plate. Fit this insulating pad to

the two right hand screwed connections (6).

Assembly and installation 4

Installation instructions geoTHERM VWS 0020046310_0120

4.12.1 Assembly of the heating system

Caution!

Risk of damage!

In order to be able to clear any possible

overpressure, the heat pump must be

connected to an expansion vessel and an

expansion relief valve, at least DN 20

with a maximum opening pressure of

3 bar (not supplied).

Danger!

Risk of scalding!

The blow-off line on the expansion relief

valve must be the size of the valve's

outlet aperture and be installed in a

frost-free environment. It must remain

constantly open. It must be fitted in

such a way that persons are not endan-

gered by hot water or steam when it

blows off.

We recommend the installation of a

Vaillant safety group and a tundish.

• Fit the heating flow and return lines with all compo-

nents.

• Insulate all the pipes.

4.12.2 Assembly, brine circuit

• Install the heat source pipes and all their associated

components.

42a

5858

Fig. 4.13 VWS heat source circuit

Key to Fig. 4.13

33 Air separator/Dirt filter

42a Expansion relief valve

49 Flow rate adjuster

57 Brine expansion tank

58 Filling and drainage tap

61 Brine circuit

65 Brine collecting tank

K Collector

42a

Fig. 4.14 Fitting the brine expansion tank

Note!

The brine expansion tank has a capacity

of approx. 6 litres and is thus adequate

for brine circuits up to a maximum of

1900 litres.

Caution!

Material damage resulting from escaping

brine!

The screw couplings on the brine expan-

sion tank must be sealed with hemp.

Sealing with, e.g., teflon tape can lead to

leaks in the brine circuit.

• Fit the bracket for the brine expansion tank to the

wall using the wall plug and the screw.

• Unfasten the pre-assembled connection pieces from

the brine expansion tank (57).

• Wind hemp into the outer threads of the connection

pieces.

• Fit the first connection piece to the 3 bar expansion

relief valve (42a) enclosed with the heat pump.

• Using the second connection piece, fit the brine ex-

pansion tank (57) from the accessory kit to the pipe

(1) running from the heat source to the heat pump.

• Fix the brine expansion tank with the bracket.

• Fit the connection piece with the expansion relief

valve to the brine expansion tank.

• Fit the brine collecting tank (65) to the expansion reli-

ef valve (42a) at zero pressure.

The brine collecting tank must not be completely

closed, as otherwise the functioning of the expansion

relief valve is not guaranteed.

• Provide all the pipes with vapour-proof thermal insula-

tion. The accessory kit contains the insulating mat

provided for the thermal insulation of the connection

plate.

4 Assembly and installation

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Vaillant geoTHERM VWS Installation guide

Brand: Vaillant

Model: geoTHERM VWS

Category: Heat pumps

Type: Installation guide

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geoTHERM 6-10kw

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Vaillant geoTHERM VWS Installation guide

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